![]() An amplifier is a circuit that has a power gain greater than one. The amount of amplification provided by an amplifier is measured by its gain: the ratio of output voltage, current, or power to input. It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude (magnitude of the voltage or current) of a signal applied to its input terminals, producing a proportionally greater amplitude signal at its output. The graph shows the input v i ( t ) Īn amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current).Ī power amplifier is similarly used to deliver output power (AF or RF), controlled by an input signal. This changes the voltage drop across the load resistance because V CC is constant.Amplification means increasing the amplitude (voltage or current) of a time-varying signal by a given factor, as shown here. ![]() ![]()
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